SciFlo Job

As briefly mentioned before SciFlo is a workflow framework. It uses a XML workflow definition document to know the sequence of steps. Each step of a workflow is known as a process. The workflow definition documents defines the flow of the processes and how to run each process. More about the workflow definition documents can be found here: SciFlo Workflow Definition

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SciFlo Bash Script

Workflow jobs are executed by the run_sciflo.sh script (chimera/chimera/run_sciflo.sh at develop · hysds/chimera).

It sets up the BASE_PATH, PYTHONPATH and other environment requirements for the SciFlo job.

It takes 3 positional arguments:

1. MODULE_PATH – Location to the adaptation module

2. WF_DIR – Path to the directory containing the workflow definition document

3. WF_NAME – Name of the Algorithm/Job/PGE to run

It exports the adaptation module’s path to the python path so the scripts can resolve dependency imports.

It constructs the location of the workflow definition document with WF_DIR and WF_NAME i.e. $WF_DIR/$WF_NAME.sf.xml

It runs the run_sciflo.py script with the required inputs. See section “SciFlo Python Script”.

SciFlo Python Script

The run_sciflo.py is the python script that executes the SciFlo job.

It takes 3 positional arguments:

1. sfl_file – Workflow definition document - has the file extension .wf.xml

2. context_file – Job’s context file aka _context.json

3. output_folder – Directory to write outputs of the job i.e. output

This script imports the sciflo_util and calls the run_sciflo function.

The command to run SciFlo is $HOME/verdi/bin/sflExec.py -s -f -o output --args "sfl_context=_context.json", "pge.wf.xml"

In the sciflo_util.run_sciflo function:

This command is constructed and run.

Based on status of the SciFlo run it logs out the error and copies the files generated by the SciFlo run into the specified output directory.